onsemi 1N4756ARL

Overview

1N4756ARL from ON Semiconductor is a 1 W, 47 V ±5% Zener voltage regulator diode in a DO-41 (DO-204AL) hermetically sealed glass package, rated for –65°C to +200°C operation, with 5.5 mA test current (IZT), 1500 Ω maximum Zener impedance at IZT, and 0.25 µA max leakage at 35.8 V reverse bias. It provides precision voltage reference and overvoltage protection in linear power supplies and analog sensing circuits.

For engineers reviewing the 1N4756ARL datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, JEDEC-compliant Zener impedance derivation, and real-world mounting guidance for stable DC biasing and regulation design.

Technical Context

The 1N4756ARL uses an oxide-passivated silicon junction with metallurgical bonded double-slug construction, enabling stable Zener breakdown under sustained 1 W dissipation at TL ≤ 50°C. Its ±5% VZ tolerance is guaranteed per JEDEC standard, with temperature coefficient of +35 mV/°C typical for 47 V devices (Figure 2).

Zener impedance (ZZT = 1500 Ω @ IZT = 5.5 mA) is derived from 60 Hz AC superimposed on DC bias (10% rms of IZT), and surge capability is defined by non-repetitive 1/120 s pulses up to 95 mA peak (IR), as validated in Figure 5 of the ON Semiconductor DO-41 General Data sheet.

Key Specifications

Pinout & Package

Package: DO-41 (DO-204AL), axial-lead, hermetically sealed glass case with cathode band marking. Double-slug construction ensures mechanical robustness and thermal stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Compared with 1N4756A and BZX55-C47, the 1N4756ARL uniquely combines 1 W dissipation, DO-41 mechanical ruggedness, and tape-and-reel readiness-making it optimal for high-reliability industrial power rails requiring both thermal margin and automated assembly support.

Availability

1N4756ARL is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, overvoltage protection circuits, and programmable threshold detection requiring stable component supply and JEDEC-compliant Zener performance.

Supply support for 1N4756ARL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, and consumer markets.

The 1N47xxA series was designed specifically for general-purpose Zener regulation in cost-sensitive, high-volume applications where reliability, JEDEC compliance, and wide temperature operation are critical-without requiring active circuitry.

FAQ

What is the Zener voltage tolerance for 1N4756ARL?

The 1N4756ARL has a nominal Zener voltage of 47 V with a standard tolerance of ±5%, meaning its actual measured VZ falls between 44.7 V and 49.4 V when tested at IZT = 5.5 mA and TL = 30°C ±1°C per ON Semiconductor's guarantee method. This tolerance is JEDEC-standardized and applies across the full operating temperature range.

Can 1N4756ARL be used in surface-mount designs?

No, the 1N4756ARL is packaged in DO-41 (DO-204AL), an axial-lead through-hole glass case-not a surface-mount package. While supplied on tape-and-reel (6000/reel) for automated handling, it requires through-hole mounting with 3/8″ lead length for full 1 W power rating. For SMT, consider alternatives like MMBZ5256B or BZX84-C47.

What is the maximum allowable lead temperature during soldering for 1N4756ARL?

The maximum lead temperature for soldering the 1N4756ARL is 230°C, applied at a distance of 1/16″ from the glass case for no longer than 10 seconds. Exceeding this limit risks cracking the hermetic seal or degrading the oxide-passivated junction, compromising long-term VZ stability and leakage performance.

How does temperature affect the Zener voltage of 1N4756ARL?

The 1N4756ARL exhibits a positive temperature coefficient of approximately +35 mV/°C near its 47 V nominal voltage, as shown in Figure 2 of the ON Semiconductor datasheet. This means VZ increases by ~35 mV for each 1°C rise in junction temperature-critical for precision references where thermal management directly impacts regulation accuracy.

Is 1N4756ARL suitable for surge protection in automotive load-dump events?

Yes, the 1N4756ARL supports non-repetitive reverse surge current up to 95 mA (IR) for 1/120 s pulses, making it suitable for clamping moderate-energy transients like ISO 7637-2 Pulse 1 or Pulse 2a in 24 V systems. However, for full load-dump (Pulse 5a, 100 V/100 ms), external series impedance or dedicated TVS devices are required to limit peak power within the 1 W rating.